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            <img src="./images/diangong.jpg" alt="">
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            <a href="">电工学</a>
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            <span class="before">原价：￥84</span>
            <span class="after">现价：￥73</span>
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            <img src="./images/jianbian.jpg" alt="">
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            <a href="">中国文化史简编</a>
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            <span class="before">原价：￥100</span>
            <span class="after">现价：￥50</span>
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